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タイトル
Bonding Strength of DLC Film on Zirconia Coating Prepared by Gas Tunnel Type Plasma Spraying
著者
Kobayashi, Akira
Kobayashi, Akira
Zhang, Jialiang
Zhang, Jialiang
Yatsuzuka, Mitsuyasu
Yatsuzuka, Mitsuyasu
キーワード等
DLC Film on ZrO₂ Coating
Scratch Test
Adhesion Strength
Gas Tunnel Type Plasma Spraying
抄録
Plasma sprayed zirconia coatings are now commonly used as the thermal barrier coatings (TBC) for high-temperature parts in many mechanical applications such as the engines of automobiles, planes and rockets. However, coating adhesion is frequently the cause for the failure of the coatings. As the same as the zirconia coatings, the deposition of diamond-like carbon (DLC) films on the metal substrate has some problem in the adhesion between DLC film and the substrate. But the adhesion property was improved by the interlayer of a hard ceramic coating on the metal substrate. In order to show the failure mechanism for coating adhesion, zirconia coatings with different thickness were prepared on stainless steel and/or aluminum substrates by a novel kind of gas tunnel type plasma spraying. The as-sprayed coatings were firstly polished and then subjected to deposition of diamond-like carbon (DLC) films using hydrocarbon gas as the carbon source. The adhesion of the DLC covered zirconi coatings was evaluated by the scratch test method. The evaluation showed that thicker as-sprayed zirconia coatings on aluminum alloy substrate showed much higher scratch durability, even with thinner zirconia coatings. The porosity and hardness of as-sprayed coatings were measured on the coating cross-sections using a micro-hardness tester and optical microscopy. The results showed that thicker coatings had higher hardness and lower porosity. The adhesion failure of DLC films on zirconia coatings is caused by two different mechanisms: one is the separation of the DLC films from the zirconia coatings and the other is the breaking of the DLC films under stress load because of the brittleness of the material. From the microscopic photos of the scratch tracks, the adhesion failure of DLC film on the thinner zirconia coatings is due to the flaking of DLC film by the distortion of aluminum alloy substrate, while the adhesion failure of DLC films on thicker zirconia coating is due to the chipping of the DLC film itself.
公開者
大阪大学接合科学研究所
公開者の別表記
Joining and Welding Research Institute, Osaka University
公開者 (ヨミ)
オオサカ ダイガク セツゴウ カガク ケンキュウジョ
掲載誌名
Transactions of JWRI
巻
35
号
2
開始ページ
29
終了ページ
34
刊行年月
2006-12
ISSN
03874508
NCID
AA00867058
URL
http://hdl.handle.net/11094/6964
言語
英語
カテゴリ
紀要論文 Departmental Bulletin Paper
Transactions of JWRI / Vol.35 No.2 (2006-12)
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著者版フラグ
publisher
NII資源タイプ
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紀要論文
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text
DCTERMS.bibliographicCitation
Transactions of JWRI.35(2) P.29-P.34
DC.title
Bonding Strength of DLC Film on Zirconia Coating Prepared by Gas Tunnel Type Plasma Spraying
DC.creator
Kobayashi, Akira
Zhang, Jialiang
Yatsuzuka, Mitsuyasu
DC.publisher
大阪大学接合科学研究所
DC.language" scheme="DCTERMS.RFC1766
英語
DCTERMS.issued" scheme="DCTERMS.W3CDTF
2006-12
DC.identifier" scheme="DCTERMS.URI
http://hdl.handle.net/11094/6964
DC.subject
DLC Film on ZrO₂ Coating
Scratch Test
Adhesion Strength
Gas Tunnel Type Plasma Spraying
DCTERMS.abstract
Plasma sprayed zirconia coatings are now commonly used as the thermal barrier coatings (TBC) for high-temperature parts in many mechanical applications such as the engines of automobiles, planes and rockets. However, coating adhesion is frequently the cause for the failure of the coatings. As the same as the zirconia coatings, the deposition of diamond-like carbon (DLC) films on the metal substrate has some problem in the adhesion between DLC film and the substrate. But the adhesion property was improved by the interlayer of a hard ceramic coating on the metal substrate. In order to show the failure mechanism for coating adhesion, zirconia coatings with different thickness were prepared on stainless steel and/or aluminum substrates by a novel kind of gas tunnel type plasma spraying. The as-sprayed coatings were firstly polished and then subjected to deposition of diamond-like carbon (DLC) films using hydrocarbon gas as the carbon source. The adhesion of the DLC covered zirconi coatings was evaluated by the scratch test method. The evaluation showed that thicker as-sprayed zirconia coatings on aluminum alloy substrate showed much higher scratch durability, even with thinner zirconia coatings. The porosity and hardness of as-sprayed coatings were measured on the coating cross-sections using a micro-hardness tester and optical microscopy. The results showed that thicker coatings had higher hardness and lower porosity. The adhesion failure of DLC films on zirconia coatings is caused by two different mechanisms: one is the separation of the DLC films from the zirconia coatings and the other is the breaking of the DLC films under stress load because of the brittleness of the material. From the microscopic photos of the scratch tracks, the adhesion failure of DLC film on the thinner zirconia coatings is due to the flaking of DLC film by the distortion of aluminum alloy substrate, while the adhesion failure of DLC films on thicker zirconia coating is due to the chipping of the DLC film itself.
citation_title
Bonding Strength of DLC Film on Zirconia Coating Prepared by Gas Tunnel Type Plasma Spraying
citation_author
Kobayashi, Akira
Zhang, Jialiang
Yatsuzuka, Mitsuyasu
citation_publisher
大阪大学接合科学研究所
citation_language
英語
citation_date
2006-12
citation_journal_title
Transactions of JWRI
citation_volume
35
citation_issue
2
citation_firstpage
29
citation_lastpage
34
citation_issn
03874508
citation_public_url
http://hdl.handle.net/11094/6964
citation_keywords
DLC Film on ZrO₂ Coating
Scratch Test
Adhesion Strength
Gas Tunnel Type Plasma Spraying